[cleanup] remove `src` directory

It only contained the default program generated by duneproject.

CMakeLists.txt

@@ -19,7 +19,6 @@ include(DuneMacros)
 dune_project()
 dune_enable_all_packages()
 
-add_subdirectory(src)
 add_subdirectory(dune)
 add_subdirectory(doc)
 add_subdirectory(cmake/modules)

src/CMakeLists.txt

-
-add_executable("dune_foamgrid" dune_foamgrid.cc)
-target_link_dune_default_libraries("dune_foamgrid")
-

src/dune_foamgrid.cc

-#ifdef HAVE_CONFIG_H
-# include "config.h"     
-#endif
-#include <iostream>
-#include <dune/common/parallel/mpihelper.hh> // An initializer of MPI
-#include <dune/common/exceptions.hh> // We use exceptions
-
-int main(int argc, char** argv)
-{
-  try{
-    //Maybe initialize Mpi
-    Dune::MPIHelper& helper = Dune::MPIHelper::instance(argc, argv);
-    std::cout << "Hello World! This is dune-foamgrid." << std::endl;
-    if(Dune::MPIHelper::isFake)
-      std::cout<< "This is a sequential program." << std::endl;
-    else
-      std::cout<<"I am rank "<<helper.rank()<<" of "<<helper.size()
-        <<" processes!"<<std::endl;
-    return 0;
-  }
-  catch (Dune::Exception &e){
-    std::cerr << "Dune reported error: " << e << std::endl;
-  }
-  catch (...){
-    std::cerr << "Unknown exception thrown!" << std::endl;
-  }
-}